From owner-freebsd-fs@FreeBSD.ORG Tue May 3 03:53:01 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8FA3A106566B for ; Tue, 3 May 2011 03:53:01 +0000 (UTC) (envelope-from jan.koum@gmail.com) Received: from mail-qw0-f54.google.com (mail-qw0-f54.google.com [209.85.216.54]) by mx1.freebsd.org (Postfix) with ESMTP id 442718FC0C for ; Tue, 3 May 2011 03:53:00 +0000 (UTC) Received: by qwc9 with SMTP id 9so3706573qwc.13 for ; Mon, 02 May 2011 20:53:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=txSRA4WIgbfpHLgc0QzARaX1P4eMOkYRbqN/jX9V+Uw=; b=Z302K1CerNseU+Sl3nzZc5uZKAebIauARiY/uwvwQGE2kmb5w66p8YMsdSDvXEFeuS P7RGKIggQhBptHWNDVOuJlzL23MdQUnnGyZDcYkT0E1nLWZ5+H3IKGfBQPmnMiOva5aZ +x0Fi98213g/h/R+rG9amnje7B14Pz9Lrr/WM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=UlBb9adK0TqfbLx02MSga+Y7sGVn4sK2c96LMs3Wwtt7UBllKqCzsSqYMu8j4DHTku Nm0zaFBefk8sHWH+WFxAae2CqKnIDpJpWGqRkxIDrTqzX7Rky5+O0kjAq4+1heXxuqwl RN4jxOOjrrVTiDwyGnMkbayvIYLJHfVo6v9u0= MIME-Version: 1.0 Received: by 10.229.43.99 with SMTP id v35mr6811819qce.8.1304394780385; Mon, 02 May 2011 20:53:00 -0700 (PDT) Sender: jan.koum@gmail.com Received: by 10.229.88.73 with HTTP; Mon, 2 May 2011 20:53:00 -0700 (PDT) In-Reply-To: References: <20110502233601.GA29710@icarus.home.lan> Date: Mon, 2 May 2011 20:53:00 -0700 X-Google-Sender-Auth: WF2x4hPXiNaF4zu51BgfAtAds4w Message-ID: From: Jan Koum To: Adam Vande More Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-fs@freebsd.org, Chris Peiffer Subject: Re: very strange IO issue with FreeBSD 8 and SSD X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 May 2011 03:53:01 -0000 On Mon, May 2, 2011 at 8:26 PM, Adam Vande More wrote: > On Mon, May 2, 2011 at 6:36 PM, Jeremy Chadwick wrote: > >> You might also try comparing iostat output to gstat output, though gstat >> refreshes the screen continually making this a little difficult. >> > > gstat -b > sure: $ sudo gstat -b dT: 1.007s w: 1.000s L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name 0 605 33 137 0.4 572 4349 34.7 10.9 ad4 0 605 33 137 0.4 572 4349 35.8 10.9 ad4s1 0 620 25 149 1.0 595 4280 22.2 9.9 ad5 0 605 33 137 0.4 572 4349 36.5 11.0 ad4s1a 0 0 0 0 0.0 0 0 0.0 0.0 ad4s1b 0 60 18 60 1.1 42 169 2.5 3.6 ad6 0 817 30 121 0.2 787 5382 15.9 8.1 ad7 0 620 25 149 1.1 595 4280 23.1 10.0 ad5a 0 60 18 60 1.1 42 169 2.6 3.7 ad6a 0 817 30 121 0.2 787 5382 16.5 8.1 ad7a > > Also top -m io may help. > > doubt it. these server only have a single process running (our app)